Approximate cost

Hello, I would need help. At my Cadillac Seville year 1978, injection (not the best) the following resulted. I have the car in the workshop in Munich, because it starts cold bad and also the crusher seals have to be replaced. The following resulted: The screws for the crusher have been torn down and have to be renewed. I already agreed. In doing so, the upper engine block had to be removed. An engine cleaning and overhaul with camshaft, control chain set, camshaft bearing, pleul bearing, crankshaft bearing, lifter, oil tank, motor sealing kit etc. are required due to the condition of the engine. In addition, alternator, engine installation and working time. In addition, gasoline pump. If everything is fixed, it should still be measured, why it starts badly, probably because of 2 sensors (everything would need 10 hours?) My question: How high sin d approx. the engine repair costs and total cost. It concerns me that I have an indication of the costs and the workshop does not require utopian prices. What cost framework is this about about??? Thank you